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I might have heard of this trailer. The smaller cousin of the "Wee Wind," known as a "Break Wind."
Seriously, this is an art project gone wrong. Looks like someone got hold of a poor 60's vintage trailer, took the rounded ends off of it, stuck them onto a short center panel, trimmed off the bottoms, and split the whole thing length wise (trimming out some of the center), installing the strip patch mentioned above with pop rivets. I can only assume that the wheels must be remove from inside. Since we can't see the rear of the trailer, my bet is that this is actually an AS shell kludged onto a motorcycle carrying trailer, and this is actually a toy-hauler disguised as an unhappy little Airstream.